// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// package math -- go2cs converted at 2022 March 13 05:42:04 UTC
// import "math" ==> using math = go.math_package
// Original source: C:\Program Files\Go\src\math\pow10.go
namespace go;

public static partial class math_package {

// pow10tab stores the pre-computed values 10**i for i < 32.
private static array<double> pow10tab = new array<double>(new double[] { 1e00, 1e01, 1e02, 1e03, 1e04, 1e05, 1e06, 1e07, 1e08, 1e09, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22, 1e23, 1e24, 1e25, 1e26, 1e27, 1e28, 1e29, 1e30, 1e31 });

// pow10postab32 stores the pre-computed value for 10**(i*32) at index i.
private static array<double> pow10postab32 = new array<double>(new double[] { 1e00, 1e32, 1e64, 1e96, 1e128, 1e160, 1e192, 1e224, 1e256, 1e288 });

// pow10negtab32 stores the pre-computed value for 10**(-i*32) at index i.
private static array<double> pow10negtab32 = new array<double>(new double[] { 1e-00, 1e-32, 1e-64, 1e-96, 1e-128, 1e-160, 1e-192, 1e-224, 1e-256, 1e-288, 1e-320 });

// Pow10 returns 10**n, the base-10 exponential of n.
//
// Special cases are:
//    Pow10(n) =    0 for n < -323
//    Pow10(n) = +Inf for n > 308
public static double Pow10(nint n) {
    if (0 <= n && n <= 308) {
        return pow10postab32[uint(n) / 32] * pow10tab[uint(n) % 32];
    }
    if (-323 <= n && n <= 0) {
        return pow10negtab32[uint(-n) / 32] / pow10tab[uint(-n) % 32];
    }
    if (n > 0) {
        return Inf(1);
    }
    return 0;
}

} // end math_package
